A Fault Location Study on Double-Circuit Transmission Lines on the Same Tower

Double circuit transmission lines on the same tower is the effective method to solve the occupied land which was erected by the transmission lines, across houses and so on, which caused the contradiction between the urban plan- ning and construction and the lives of the residents. However, in the event of a failure, the main outstanding issue is how to locate the fault more accurately in the case of the effect of the same tower double circuit transmission lines of magnetic coupling on the measured data. The principle of the method is based on S transformation to utilize the energy of the fault phase current signal and the corresponding average voltage to detect and locate the fault of the same tower transmission line. A phase to earth fault as an example is researched in this paper and then the modeling and simulation through the application PSCAD is conducted. Further, the effectiveness of the proposed method is verified, meanwhile, it will lay a foundation for researching on the more towers of transmission line fault.